diff --git a/pyperf/_worker.py b/pyperf/_worker.py
index 33a0449f..4fc83516 100644
--- a/pyperf/_worker.py
+++ b/pyperf/_worker.py
@@ -59,8 +59,8 @@ def _compute_values(self, values, nvalue,
         task_func = self.task_func
 
         # If we are on a pystats build, turn on stats collection around the
-        # actual work, but only if we aren't warming up or calibrating.
-        if hasattr(sys, "_stats_on") and not is_warmup and not calibrate_loops:
+        # actual work, except when calibrating.
+        if hasattr(sys, "_stats_on") and not calibrate_loops:
             core_task_func = task_func
 
             def stats_func(*args):